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User scheduled direct memory access using virtual addresses

  • US 5,301,287 A
  • Filed: 02/16/1993
  • Issued: 04/05/1994
  • Est. Priority Date: 03/12/1990
  • Status: Expired due to Term
First Claim
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1. An interface device for transferring data associated with data processing commands directly between a user'"'"'s host system having a main memory and an external data processing system in response to user commands without direct host operating system management during individual memory transfer transactions, comprising:

  • means for representing said data processing commands and associated data as command/pointer packets comprising said data processing commands and virtual pointers to said associated data in virtual memory space of the user'"'"'s host system;

    means on said interface device, coupled to said virtual memory space, for directly translating said virtual pointers of said command/pointer packets to physical pointers which identify physical addresses within said main memory at which said associated data is located; and

    means on said interface device for transferring said associated data from and to said main memory at said physical addresses.

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